2016 ISX15 Cummins Fuel issue?

[Rawze]

(02-03-2024 )steeldck Wrote:  That Pump had 650k on it for Miles. Im trying to find out if he took the pump apart. I know the ones ive seen had been worn, like the cam and rollers had some wear spots in them, havent seen or heard of one exploding pieces into the engine though. This truck ran just fine on the way to the shop to get it checked out, like I said, the problem was intermittent from the get go, even before the fuel pump was replaced.
I took the pump back to the parts stealer for the core charge, I should check to see if its still there, pull the head
Rebuilding or replacing a fuel pump on a rig with 400k on it, seems a bit fugged to me.

Everything that tree98 said is 100% certifiable and valid!.

YES.. THAT PUMP needs it guts replaced every 400k miles (or 8,000 hours) to prevent the VERY WELL KNOWN fuel pump of total engine destruction scenario... and the 559 fault is the only indication that the pump has failed and is now destroying your entire engine internally.

-== so.. THIS IS NOT FUGGED, OR SUS !!!... THIS IS REALITY!!.


I read your posts and they point out something obvious.

You keep saying they are doing injector performance tests .. those tests are useless and always have been. This shows the lack of skill by whoever is working on that thing. It also shows a serious lack of skill by whomever rebuilt it too, as they should have pulled that fuel pump apart during the inframe with 650k miles on it.. inspected it, and replaced its guts as part of the process.

It looks to me like you have put way too much faith in whoever rebuilt it and whoever is working on it. This is not good, as your own posts show clear signs that they are beyond clueless!.

Let me guess.. Is this (or the rebuild done) at an OEM shop? or at a stealersH$it?.. because that is where you find such clueless people the most?. Those OEM facilities are the most clueless and the most under-trained of all places these days.. but a lot of non-oe shops are just as guilty too.

so.. your posts imply heavily a few serious mistakes ...

mistake#1...
When the engine was inframed.. THAT FUEL PUMP should have been rebuilt as part of it too, this especially if it was determined that it had more than 400k miles of run time on it. This shows a serious lack of knowledge for the ISX and its well known weakness of that pump.

mistake#2 ...
DID ANYONE do a proper rail leak-down test on the engine after it was put back together .. then run enough to get the air out of the fuel system + brought up to temp once?. -- NOT LIKELY,, AND STILL LIKELY HAS NOT BEEN DONE!!!.

- According to your posts, they blindly replaced the pressure relief valve.. and this mysteriously made less '559' codes?. THIS IS A CLEAR SIGN that no one bothered to do any sort of rail leak testing NEITHER DURING OR AFTER THE INFRAME LIKE IT SHOULD HAVE BEEN DONE!!!.. BUT ALSO NOT EVEN AFTER THERE WERE PROBLEMS!.

DO A PROPER INJECTOR LEAK TEST ON IT!... FIND OUT WHAT THE ACTUAL LEAK RATE IS IN ONE MINUTE when the rail is brought up to the full 30,000 PSI pressure!. here is how to do it...
ref: http://rawze.com/forums/showthread.php?t...3#pid75483

For all anyone knows.. it could still be failing badly due to some idiot moron mechanic installing the quell tubes for the injectors incorrectly, or by using a damn speed-gun on them, and/or not torquing them properly.

How much you want to bet that pressure drops below 25,000 psi on one minute?.-- THAT IS HOW YOU CHECK IT FOR BAD INJECTORS!.. instead of throwing moneys at it like a fool.

mistake#3 ..
NO ONE pulling that pump apart as soon as that 559 code was seen. When the fuel pump fails and starts destroying the engine.. the only codes that is seen is usually that 559 code and not much more. Driving it against a failed pump destroys the entire engine in only a few days whenever that pump fails. - IT SHOULD HAVE BEEN FIRST PRIORITY as soon as that code poped up. - Again.. complete incompetences and improper training on that mechanics part for 'REPLACING IT ON A GUESS' and now no one knows if it was destroying the engine internally or not. NO ONE took it apart to see if it was failing.. and to replace its guts if it looked good!. This also wasted a LOT of moneys if it was not the issue. Frankly.. it should have had its guts changed out as standard procedure DURING THE INFRAME!... but even so.. its guts should have been changed out as soon as that code was seen.. just because its over-due!.

^^ Incompetence at its best there.^^

mistake#4 ...
You say its de-mandated. - This is the biggest killer of lifespan for these red engines.. because more than 90% of all 'delete' programming is absolutely harmful. This should have been addressed DURING THE INFRAME to ensure that the engines failure was not premature. This is to protect that investment of rebuilding it from another possible premature failure.

so.. you need to COPY THE PROGRAM from the ecm and e-mail it to me for a proper review of what someone did in there. That way you can sleep at night knowing that the programming isn't eating the internals to an agonizing death and it needing another inframe in a few years or so again.


and lastly.. WHAT DID THEY SET THE LINER HEIGHT TO WHEN THEY COUNTER-BORED IT during the inframe?. Did they even counter-bore it>? -- That is another VERY important question, as most shops these days are beyond incompetent for rebuilding ISX's..,a and if they made the mistakes with the rail and fuel pump.. what other mistakes were made?.

Sounds to me like you are going to learn the hard way how to properly own an ISX. - there are so many problems with them because people who own them do not know any better and trust a network of incompetent idiots who are clueless,..and a moron around every street corner with a 'delete' file to shove into it that shortened the life of the engine by half or less.

They don't find these things out until its far too late and they are right where you are... with a lot of headaches, lots of wasted moneys, half-arsed in-frames (oem's being the most guilty), and a lot of aggravation.